[Tile-serving] [osm2pgsql] Allow polygon/linestring decision to be set by value in lua (#346)

[mboeringa]

@math1985 , you do take into account possible secondary **building NOT IN (Null,'no')** tags? Historic citywalls are sometimes mapped as buildings with individual parts as closed loops / ways. So they may have both a **historic = citywalls** and **building = yes** tag.

Anything tagged with a building tag should be excluded from this evaluation I think.

I am also not sure about defaulting closed ways of **man_made = breakwater** and **man_made = groyne** as linestrings. I agree these are "linear" features by nature protruding from the coast or riverbank, ***but if mapped as a closed way***, they almost certainly represent a micro-mapped polygon representation of the feature, so should likely be polygons.

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